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2/3+1/7等于多少

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这道题这样算, 2-1-(3/7+2/7)=2/7, 就是这样的

2/3+1/7 =14/21+3/21 =17/21

原式=21/24+12/24-16/24=(21+12-16)/24=17/24 祝好运

3/8x1/7=3/56

1. 3/7 × 49/9 - 4/3 2. 8/9 × 15/36 + 1/27 3. 12× 5/6 – 2/9 ×3 4. 8× 5/4 + 1/4 5. 6÷ 3/8 – 3/8 ÷6 6. 4/7 × 5/9 + 3/7 × 5/9 7. 5/2 -( 3/2 + 4/5 ) 8. 7/8 + ( 1/8 + 1/9 ) 9. 9 × 5/6 + 5/6 10. 3/4 × 8/9 - 1/3 11. 7 × 5/49 + 3/14...

2

2+1/2+2/3+3/7 =5/2+2/3+3/7 =15/6+4/6+3/7 =19/6+3/7 =133/42+18/42 =151/42 ≈3.59523809 523809……(523809循环)

3☆7=3×7-3+7=25

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